Die for trimming blanks.



R. L. WILCOX.

DIE FOR TRIMMING BLANKS.

APPLICATION FILED JULY 12.1918.

L29%99Um Patented Feb. 18, 1919.

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Specification of Letters Patent.

Patented Feb. lid, THTF.

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To all whom it may concern."

Be it known that T, RICHARD Lnsrnn WIL- 001:, a citizen of the UnitedStates, and a resident of Waterbury, county of New Haven, State ofConnecticut, have invented certain new and useful Improvements in Diesfor Trimmin lBlanks, of which the following is a specification.

My present invention relates to unprovements in dies for giving atrimmed crosssection to a blank as is done, for instance, in forming thesquare, hexagonal or octagonal shapes of bolt heads, nuts, and the like,or a many sided shape of any kind such, for instance, as a circularsection with flat s des as is formed on shackle bolts and the like. itwill be understood that by polygon or polygonal I mean any such. shape.blank may also be cut so as to have a c1rcular section.

One of the objects of my invent1on,a mong others, is to produce a diewhich Wlll be easy to construct and at the same time easy to sharpen ina simple manner. Another object of my invention is to produce such a diewhich will be capable of adjustment.

Tn the accompanying drawings Figure 1 represents inperspective anillustrative form embodying my invention;

Fig. 2 is a cross-section in elevation through the die illustrated inFig. 1 taken on the line 2--2;

Fig. 3 is a plan vieW of a modification, in which some of the parts areadjustable.

The corresponding parts are referred to both in the drawings and in thespecification by similar reference characters.

Referring to Figs. 1 and 2, the form of die here illustrated is of thesolid type, being made of a single piece of metal. Extending through thedie from top to bottom is an opening 10 which, in this particularinstance, is such that its cross-section is an equilateral hexagon. Thetop surface 11 of the die is preferably turned conically and theintersection of this conical surface with the edges of the opening 10produces cuttin edges.

11 some cases it is desirable that the cutting edges be shaped in such away that the article to be trimmed will be out angularly as the die andthe article move relatively to each other along the axis of the opening10. This is accomplished by making some of the cutting edges so that onepoint of such edge is higher above the base of the die than another.Such an arrangement is provided 1n my copendmg applications, Nos.219,170 and 219,172, each filed February 26, 1918, but have found thatangular cutting edges of this type may be more readily produced byprovidmg around the top surface of the die a series of substantiallyflat surfaces 12 which make acute angles with the axis of the opening10, and preferably With the surfaces arranged so that they are in edectthe sides of a pyramid, in which case each surface will form a rightangle with the plane passing through the axis of the open ing 10 andthrough the center line of the surface. With the cutting edges formed bysuch surfaces the die may be readily sharpened by passing a grindingwheel across these substantially flat surfaces.

The angular cutting edges may be formed in several ways by the surfaces12. Tfthe opening 10 is circular in cross-section, then obviously thespacing of the surfaces 12 around the opening 10 is more or lessimmaterial, although it is preferable that they be so arranged that theyjoin each other at the edge o-fthe opening. By so doing all parts of thecuttin periphery of the open in will have a direction angular to theaxis of the die. "When the opening is polygonal in cross-section, Tpreferably arrange the surfaces 12 so that two adjacent cutting edgeswill form an angle at their intersection. In this way, one of such pairof cutting edges will throw its chip to one side of the axis of the diewhile the other edge will throw its chip in the op osite direction, Thismay be accomplished b of the apexes or angles of the polygon.

When the opening 10 is an equilateral polygon, such as the cross-sectionof the usual square or hexagonal bolt head or nut, the preferable formof angular cutting edges may be provided by arranging the surfaces 12 asshown in Fig. 1; that is, with the surrface broad enough at itsintersection with the periphery to include two sides of the hexagon andwith the surfaces 12 meeting each other at the apexes or angles of thehexagon. An inspection of Fig. 1 will show that each of the cuttingedges thus formed tit til

y forming the surfaces 12 so that each will contain one Win tilt" willhave an angular approach to the article joining each other between theapexes or angles of the polygon. Thus, in the die I shown in Fig. 1,wlth the equilateral hexagonal o ening. 10, surfaces could be provlded,eac with one of the angles of the hexagon lying between the outer limitsthereof and such surfaces Joining each other mldway, for instance, oneof the sides of the hexagon.

It will be understood that, while preferably I make the surface 11conical, which facilitates its manufacture, this top surface 11 may bealmost any shape, because obviously it performs no function in thecutting operation. It might readily, therefore,

be, for instance, at right angles to the axis of, the die, in which casethe surfaces 12 would be out below the level of the top. surface of thedie.

For man purposes, and particularly when used in connection with themethod illustrated in my copending application No. 219,170, it isdesirable that the opening 10 shall extend completely through the die,although for many purposes this is not necessary.

For some purposes, it is desirable to provide a die with independentcutting edges, such as shown in Fig. 3 which, as will be understood, isprecisely the same as illustrated in Figs. 1 and 2, except that thecutting edges are formed on separate pieces of steel 1 1,which in theform illustrated in Fig. 3 are shaped as the 'frustums of pyramids, thetops of which form the sides of the opening 15 and the bases contactwith a hexagonal opening. in the body member 16. The members 1 1 areheld in place by screws 17. The arrangement thus described is similar tothat of the copending application of cisely the same, except that inFig. 3 the die is made in parts so that the cutting edges are located onseparate members instead of on the solid die. All of the modificationsheretofore suggested as to the form shown in Fig. 1 apply equally Wellto the form shown in Fig. 3. I

surfaces forming a right angle with the plane passed through the axis ofthe opening it nd intersecting the surface at its center 2. A die havingan opening therein and a plurality of substantially fiat surfaces on thetop face of the die,-the planes of such surfaces making acute angleswith the axis of the opening and intersecting the edges of the openingto form a series of cutting edges in the periphery thereof,- thesurfaces meeting each other at the periphery of the opening, each of thesurfaces forming a right angle with the plane passed through the axis ofthe opening and intersecting the surface at its center line.

3. Adie having an opening therein and the top face of the die slopingaway from the periphery of the opening, and a plurality of substantiallyfiat surfaces on the top face with their planes making acute angles withthe axis of the opening and intersecting the edges of the opening toform a serles of cutting edges in the periphery thereof.

4. A die having an opening therein and the top face of the die slopingaway from the periphery of the opening, and a plurality of substantiallyfiat surfaces on the top face' with their planes making acute angleswith the axis of the opening and intersecting the edges 'of the openingto forma series of cutting edges in the periphery thereof, thesaidsurfaces meeting each other at the periphery of the opening.

5. A die having a polygonal opening therein and a plurality ofsubstantially flat faces on the top face of the die, the plane of eachof such faces making an acute angle with the axis of the opening, and

the plane of each of such faces making an acute angle with the axis ofthe opening and extending across two of the sides 0 the polygonalopening where said faces intersects the opening, to form a series ofcutting edges around the periphery of the opening.

7. A die having a conical top face and an' equilateral polygonal openingtherein and a 1% weaned Jew plurality of substantially flat faces on thetop face of the die, the plane of each of such faces makin an acuteangle With the axis of the opening, and extending across two of thesides of the polygonal opening where suchlfaces intersects the opemng,to form a series of cutting edges around the periphery of the opening.

8. A die comprising a body member and a plurality ofcutting members heldtherein,

each of the members having a cutting edge and the members beingconstructed and arranged and held in the body member so as to form apolygonal opening therein, With the cutting edges forming the peripheryof the opening, the die being provided with a plurality of substantiallyflat surfaces making acute angles with the axis of the opening andintersecting the opening at the cutting edges, With the cutting edgeslying in the said surfaces.

' RICHARD LESTER WILCOX.

